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Studi Eksperimental Variasi Celah Katup Hisap dan Katup Buang Terhadap Performance Speda Motor 4 Langkah Menggunakan Bahan Bakar Biopremium E10 sarjono sarjono
SIMETRIS Vol 12 No 1 (2018): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Research has been conducted on experimental studies of the slit Valve's variation in suction valves and exhaust valves against Performance Speda Motor 4 step using the fuel Biopremium E10. The study aims to figure out the performance of a four-step motor spec with a variation of suction valve gaps and exhaust valves using a Biopremium E10 alternative fuel. The results showed that with a suction valve gap of 0.08 mm and a exhaust valve gap of 0.11 mm in the round range of 6000 rpm, the resulting power and torque was the maximum of 9.2 HP and 11.04 Nm, as well as the use of specific fuel effective (SFC) The most economical of 0.0821 kg/kWh
Studi Eksperimental Penggunaan Bahan Bakar LPG Terhadap Emisi Gas Buang CO dan HC Pada Motor 4 Langkah sarjono sarjono
SIMETRIS Vol 12 No 2 (2018): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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The growing number of motorised vehicles, bringing out two serious threats: the first economic factor in the form of oil fuel that is getting longer is thinning. To the two factors of environmental pollution, which is the pollution caused by the combustion of oil fuel either directly in the form of harmful exhaust emissions such as CO, and HC and indirect pollution in the form of global warming Potential Caused by the amount of CO2. Therefore, it takes an environmentally friendly alternative energy as fuel, one of which is LPG fuel (Liquefied Petroleum Gas).The purpose of this research is to determine the influence of the use of LPG fuel against the exhaust gas emissions of CO, and HC on 4-Step Motors. The results showed that the use of LPG fuel on 4 Stroke Motors was able to reduce emissions of exhaust gas CO and HC. The lowest CO-rate occurred at a 1500 rpm round of 0.49% vol, while the highest HC at 1500 rpm was 358% Vol. While the lowest CO2 at the 1200 rpm rotation was 2.94% Vol. Specific fuel consumption (SFC) tends to be more efficient than Using premium fuel, because the use of LPG fuel provides the optimization of combustion. This is due to the fuel-air mixture that goes into the cylinder of the combustion chamber into a homogeneous mixture and causes perfect burning.
Unjuk Kerja Model Turbin Angin Poros Horizontal Dengan Variasi Bentuk Blade sarjono sarjono
SIMETRIS Vol 13 No 2 (2019): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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The purpose of this research is to find out the Horizontal shaft wind turbine Model work with Blade shape variations. In this research the variation is done on the blade shape. The Blade is designed with curved shape, inverted linear taper and rectangular with size 8 cm x 20 cm at 20o tilt angle with wind speed 7; 8; 9; 10; and 11 m/s. The results showed that variations in the blade shape affected the horizontal shaft wind turbine work. Brake Horse Power (BHP) is maximally obtained with a rectangular shape blade of 1, 1 watt at a wind speed of 11 m/s with a torque of 0.0221 Nm on the blade shape and the same wind speed. While the high efficiency is achieved with a rectangular shape blade at a wind speed of 7 m/s by 21%.
Pengaruh Variasitekanan Pengepresan Terhadap Karakteristik Pembakaran Briket Arang Daun Jati (Tectona Grandis L.F) sarjono sarjono
SIMETRIS Vol 13 No 1 (2019): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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The potential of biomass teak leaves as an alternative source of energy is so abundant, but not yet fully realized. Teak leaf is one type of biomass that can be used as an alternative fuel. The objective of this research is to determine the influence of pressure variation on the combustion characteristics of teak biobriket charcoal. Testing carried out with a variation of pressing pressure of 350 psi, 600 psi, 850 psi, 1100 psi and 1350 psi.The test results of the influence of pressure variations on the presses against the combustion characteristics of teak charcoal briquettes show that biobriket with lower dipbriglutinous pressure has the highest combustion rate of 0.0928 grams/second. The combustion temperature rate reaches 486.4 ° C and the lowest temperature is 384.3 °c. Mass reduction will be quicker if the temperature of the air flowing into the fuel chamber is higher. The decrease in mass will be faster if airflow speed is raised. Low glutinous pressure causes the fuel to be shorter in its burning time.
Co-Authors Bernando Bernando Riyanto Wibowo